Another amazing video Derek, don't know why they've changed working pressure to operating pressure confusing our little brains. 😂😂, this was a brilliant video & well presented like always whether its in the classroom with you or watching you on videos you're always the top Tutor.. 👍👍😀😀

This bought back memories...I did my Indentured Gas Apprenticeship in the 1960s when we still had "town gas". In those days the apprenticeship was from leaving school at just 15 to 21, almost 6 years. But, in those days we learned everything about gas, from how gas was made, how it was distributed throughout the district gas mains, how and why gas holders were built. etc, etc... It was a great apprenticeship, taught me well, and gave me a good living... oh, and it was quite common to get a clip round the ear off your fitter if you gave him some lip... Great times.

You are a legend! Thank you so much and very appreciated. You are actually extremely helpful and clear on explaining. Everything spot on.

Always top videos off Derek

Great video , I was a bit confused before watching the video about the Permissible Drop but now I'm fully understood , Thanks Derek

thank you DEREK FOR YOUR GREAT SERVICE ,GREAT TEACHING

You are such an incredible technical instructor. You’ve assisted most of us initial assessment understanding the practical know how to the industry.

Thank you Derek, like always I really enjoyed your videos, the explanation very clear

I think I’ve watched nearly all of your tutorials I now fully understand what you are saying keep up the good work and keep them coming Derek kind regards Tony gaunt🤗

As allways absolute amazing mate ✌️👍😊well explained !never seen a better trainer !!you have the German in you 😘Connor

Great video on tightness testing and pressures at the meter very clear thanks.

What a legend. Thank you for sharing your knowledge

You are a very good teacher.. down to basic and then you build up knowledge for learners to understand.Thank you

Nice job ❤

Very informative video. Thanks Derek 👍😀

Outstanding video so clear and the details are perfect It's finally printed into my brain You deserve more commendation for your work 💪

Good video for proper understanding let by and all test thanks Tom

Really injoy watching easy to understand thanks keep the good work up

I am indeed very grateful for this explanation

Derek your a legend keep the vids coming!

Brilliant video derek. Revising for my Initial assessments. Thanks for giving us the understanding of not just carrying out standing & operating pressure but to understand why we have these figures in place i.e 21+-2. Trainee at tomkat gas training center. 🙂

Always brilliant derek

Great video...thanks Derek.

explained in easy steps. thanks Tomkat

Thank you for all your videos derick

Never knew why it had to be 19-23.. I do now. Thanks for plugging another wee gap in my knowledge.

great !!! well explained , Tom good job

Thank you Derek.

GREAT STUFF DEREK THANKS

Great video, thank you 👍

...a great video Derek. Keep up the amazing videos you take the trouble and time to make. Just to give you some insight as to why they have changed 'working pressure' to now 'operating pressure. I know this video is I guess over two years since you made it, bvut I have just come across it now. That is'enough of the waffling, lets get right into it' as you say. 1. Working pressure: Well, working pressure is not a 'dare I say' a 'standard' . Unless ofcourse 'all' appliances were made to 'operate' at a specific given @ Rate of figure. Design, materials, size, etc will no doubt differ from for a start manufacturer to manufacturer as well as country to country. Operating pressure: So they rightly come up with the term 'operating pressure'.. This can now be used as a means of 'standard', covering all types of appliances as the manufacturers have stenciled the 'working/operating' pressure on the unit. 2. Standing pressure The 'standing pressure' is there as a form of supply and demand. Just to illustrate , lets bring in a water/shower pump. Say I connect up the water pump to the water Mains supply and Not an Overhead water Tank ! What will happen ? Depending on the regular 'usage', the pump will burn out , and that is within say 1 week. If you are lucky maybe 2 weeks. Why is that? It is because the 'standing' pressure is not meeting the 'operating' pressure of the pump. So the pump manufacturers as part of their design have used the 'standing' pressure as part of the formula to manufacture their different pumps. But the 'standing' pressure is Not the water Mains supply, but a water Tank. This will ensure there is enough water to meet the 'standing' pressure for that particular water pump. Hope my waffling helps. lol

Clear Explanation on every thing regarding pressure, thanks Derek! ‘Bilal M’ trainee tomcat.

Excellent video 👍

These videos are so helpful sir

Great video on tightness testing and pressures at the meter. Everything explained nicely and easy to understand. From now on I will try to refer to working pressure as operating pressure! Does anyone else take ages filling a u-gauge with water and trying to level it at zero and get soaked whilst doing it or is it just me 🤣. Thanks Derek 👍🏻 Asian Jon. Training.

Thankyou Derek

Excellent video 5*

You the man bro..👍

Ray Hurrell brilliant

Excellent 🌹

Very simple explanation pal 👍

Thanks a lot darek

I hope i will learn too Derek

Great vid again Derek 👍 Aaron j trainee 😁

Thanks again Derek for sharing this helpful information with us it’s been very easy for me to understand that, also wondering where to getting a U_gauge like you’re using it in this video 🙏

Thanks.

Thank you, Nikola Ditsov

Very good and appreciated Now if you can make some video on Regulations, ID,At Risk,responsibility of Landlord, Gas suppliers, and engineers, Thank you Derek Bless you 🙏

Many thanks It’s for me I have requested Sir thanks

Thanks

Yes, you did say that if you have a drop you then test the carcass whcih is allowed a zero drop. This basically means the drop allowance is on an appliance that is fitted. (assuming no smell)

Thanks you 🙂

thanks for good explin and show how to do test working test and standing test

❤

👍👍

👍🏼

Great video again thanks . Are you planning to do videos on chimneys ( a long and interesting topic...)

Great video as usual, could you please explain the following in your next video: Why is any MB drop allowed on appliances, it’s a gas leak! What is the correlation between type of meter and size of MB dropped allowed. Again great channel. 👍👍

👏🏻✅

If a six ring cooker do you put on 5 rings to get operating pressure

Ali 👌👌👍👍

Thanks on to part 2 now

👍🤓👍

Thanks again, great video. For operating pressure at meter, would you put all appliances on maximum at same time if you have more than one in property, say a boiler and cooker. Or just one appliance at a time? Thanks

Hi, when doing working pressure for the cooker, wouldnt you need to put the oven on full rate also?

If you can tell if the boiler is work how much i have read gas in gage that mean drop thanks

Tanx for the upload plz if you could can you do fault finding on combi boilers,tanx

thanks. if you zero the u gauge then wouldn't the readings always be the same either side? what's the point in doing the calculation of bother sides ÷2 if both sides are the same?

Are you allowed to leave the u gauge attached to the meter unattended when you go and start up the boiler to check working pressure?

👍 Sue Warrington

Derek, I have the following question: if I have a let by 5mbar/min and leak of 5mbar/min (for example) would I ever find out and how?

I’m just an interested viewer, ( ex industrial process operator) regarding the U tube manometer, when would their be an occasion when one side scale reading be a different reading than the other side ?

Great content Derek can u just ask if the operating pressure at the meter is wrong what action would you take? And what would cause it? Thankyou.

Derek great video. Since this video was posted there has now been a small change the operating pressure is now from 18.5mb - 23mb. Dont know why?

Tomkat 👍🏻

I don't understand why they say add the two (water gauge) readings together and divide by 2. As long as you have zero'd the meter prior to any test the readings will be identical on either side - so you can just go off the positive side on the LHS. Just seems to be complicating matters. They should state you always zero the meter prior to any test ! I think its just making it confusing by adding the extra arithetic....

Question, when you are performing the pressure test on the ECV, how do you know that it is the ECV that is at fault and not another part in the system?

CH 👍

Good video well done 👍 What is the difference between working pressure and operating pressure?

17:40 A gas flow rate of 3.5 m3/h should give you (3.5/0.095=36.8) 36.8 kW. A minimum gas flow rate of 0.5 m3/h should give you (0.5/0.095=5.3 ) 5.3 kW.

@Derek, in Gas college they always told us the first thing you do before testing is using a volt stick on the meter on the anaconda I believe. no gas engineer ever does it though lol, do they have a point? is it uk reg? I think one in a million engineers got shocked or something one day

Chris tanker 👍

Thanks. Why is it the case a drop is allowed with existing appliances connected? I may be completely stupid, but a drop is a drop no? Gas is escaping. Isn't that a problem? The wording the books and everyone uses seems to confuse things. Plenty of engineers seem to think if there is a drop on an existing system with old appliances and its within range then that's ok. Even the books don't explicitly make it clear that if you test with appliances on you have to ensure the the drop is on the appliance by isolating the appliance. The books split criteria for pipework into new and existing when really they should just say no drop is allowed and if you find one you have to ensure it's on the appliances.

When doing working pressure do turn all appliances on? Or is that on if when testing inlet?

If there’s excessive gas pressure at the appliance what impact would this have?

So can i clarify pls. Working pressure/operating pressure is taken at the actual appliance and also the meter and allowed a drop of 1mb? Also what is the difference between a let by test and standing pressure? Surely in a letby your testing the section of pipe all the way from the ECV and throughout all the pipework up until the appliances in the house(so just the pipework in system with all appliances off).surely this area being tested is exactly the same in the letby and the standing pressure test?

I think they should just get rid of allowable drops on domestic as once you disconnected everything and see the hobs leaking 3mb who really re connects it and what customers ever say ok Hob leaks gas but it’s fine!

How can you have 23 mb (standing P) when the regulator is set to cut off at 21 mb ?

Do you do standing pressure then working inlet and burner (if not zero gov) Just because I’ve seen another KZfaqr day do working then standing

17:55 MOP: meter operating pressure

tomkat👍

Hello sir I have one question....,, There is a imperial meter ,but can find type on it what means that ???? Is it G4 u6 E6 what type of meter is it ??

differential manemometer or u guage but?? do you know the difference?

Hi mate, when doing inlet at boiler and combustion. If I’m using a fga can I use them at the same time? Would I just isolate the gas put my probe in and attach my hose to inlet then put boiler to max and turn gas back on?

Why test the standing pressure and is there actually a requirement to do so? Please let me know if I’m wrong, but I was always under the impression the meter governor operated whilst gas was flowing through it-not whilst standing.

what is the lowest working pressure you can have at meter outlet at peak demand?

I also have no clue why they keep changing the standards

Jon-Paul Ward

chris taylor

Marc Crowther